EP1022524A1 - Appareil et procede pour le nettoyage des tuyaux d'une unite de refrigeration - Google Patents

Appareil et procede pour le nettoyage des tuyaux d'une unite de refrigeration Download PDF

Info

Publication number
EP1022524A1
EP1022524A1 EP98941762A EP98941762A EP1022524A1 EP 1022524 A1 EP1022524 A1 EP 1022524A1 EP 98941762 A EP98941762 A EP 98941762A EP 98941762 A EP98941762 A EP 98941762A EP 1022524 A1 EP1022524 A1 EP 1022524A1
Authority
EP
European Patent Office
Prior art keywords
refrigerant
cleaning
transfer heat
piping
heat exchangers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98941762A
Other languages
German (de)
English (en)
Other versions
EP1022524A4 (fr
Inventor
Takeo Kanaoka-Kojo Sakai-seisakusho UENO
Toshihiro Kanaoka-Kojo Sakai-seisakusho IIJIMA
Masaaki Kanaoka-Kojo Sakai-seisakusho TAKEGAMI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daikin Industries Ltd filed Critical Daikin Industries Ltd
Publication of EP1022524A1 publication Critical patent/EP1022524A1/fr
Publication of EP1022524A4 publication Critical patent/EP1022524A4/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B45/00—Arrangements for charging or discharging refrigerant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/16—Receivers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/18—Refrigerant conversion

Definitions

  • the present invention relates to a piping cleaning system and a piping cleaning method for refrigeration units including air conditioners and refrigerators.
  • existing refrigerant piping In renewal demands of various types of air conditioners, existing refrigerant piping is often re-used as it is. In such a case, if a refrigerant for the existing refrigerant circuit and a refrigerant for a new refrigerant circuit are the same CFC (chlorofluorocarbon) or HCFC (hydrochlorofluorocarbon) refrigerant, the existing refrigerant piping can be used without causing any significant problems.
  • CFC chlorofluorocarbon
  • HCFC hydrochlorofluorocarbon
  • HFC hydrofluorocarbon
  • an object of the present invention is to provide a piping cleaning system and a piping cleaning method for refrigeration units capable of cleaning the refrigerant piping with good efficiency.
  • the present invention provides a piping cleaning system for refrigeration units, comprising:
  • the refrigerant piping is cleaned by circulating the refrigerant through the cleaning circuit.
  • the amount of refrigerant with which the refrigerant piping is cleaned is detected by the refrigerant amount detecting means and, based on the detected amount of refrigerant, the cleaning refrigerant amount is adjusted by the adjusting means. Therefore, according to this invention, any excess or shortage of the refrigerant with which the refrigerant piping is cleaned can be eliminated, and so the refrigerant piping can be cleaned efficiently.
  • a short amount of the cleaning refrigerant would cause the cleaning performance to lower, while an excessive amount of the cleaning refrigerant would lead to a less smooth circulation of the refrigerant.
  • a piping cleaning system for refrigeration units further comprises a transfer heat exchanger provided halfway on the cleaning circuit;
  • the transfer heat exchanger performs a heat pump action of alternately iterating the sucking operation by cooling a gas refrigerant within the transfer heat exchanger to effectuate depressurization thereof so that a refrigerant is sucked in from outside thereto, and the discharge operation by heating the refrigerant within the transfer heat exchanger to effectuate pressurization thereof so that a liquid refrigerant is discharged therefrom.
  • a piping cleaning system of another embodiment comprises two transfer heat exchangers provided halfway on the cleaning circuit and connected in parallel to each other; and
  • the two transfer heat exchangers perform a heat pump action of alternately iterating the sucking operation by cooling a gas refrigerant within the transfer heat exchangers to effectuate depressurization thereof so that a refrigerant is sucked in from outside thereto, and the discharge operation by heating the refrigerant within the transfer heat exchangers to effectuate pressurization thereof so that a liquid refrigerant is discharged therefrom.
  • the adjusting means of the cleaning refrigerant amount is implemented by
  • the cleaning refrigerant in the cleaning circuit when the cleaning refrigerant in the cleaning circuit runs short, the cleaning refrigerant can be supplied to the transfer heat exchanger through the refrigerant resupply line and the cleaning refrigerant can be heated by this transfer heat exchanger, so that the cleaning refrigerant can be resupplied to the cleaning circuit efficiently. Also, when the cleaning refrigerant in the cleaning circuit is excessive, excess refrigerant accumulated in the transfer heat exchanger can be bled efficiently by the refrigerant bleed line. Thus, the amount of cleaning refrigerant can be maintained normally at an appropriate level, and the refrigerant piping can be cleaned efficiently.
  • separating means for separating foreign matters from the refrigerant is connected to the cleaning circuit, and
  • the cleaning performance by the cleaning refrigerant can be maintained by separating foreign matters from the cleaning refrigerant by means of the separating means, and besides the amount of cleaning refrigerant can be detected by the refrigerant level sensors provided on the separating means.
  • the heat pump has a throttle mechanism connected between the two transfer heat exchangers, a compressor and a four-way switching valve, and also has a heat pump circuit other than the cleaning circuit through which the cleaning refrigerant flows, wherein a flowing direction of working refrigerant flowing through the heat pump circuit is switched over by switching over the four-way switching valve, by which the sucking operation and the discharge operation of the two transfer heat exchangers are switched over;
  • the one transfer heat exchanger is switched over from pressurizing operation to cooling operation while the other transfer heat exchanger is switched over from cooling operation to pressurizing operation.
  • the liquid-phase cleaning refrigerant is accumulated to a specified amount in the other transfer heat exchanger under cooling and a cooled refrigerant is sucked into the compressor, where when the discharge gas temperature of the compressor becomes not more than a specified value, the four-way switching valve switching means switches over the four-way switching valve. Still also, when suction gas pressure of the compressor becomes not more than a specified value, the four-way switching valve switching means switches over the four-way switching valve.
  • the refrigerant amount detecting means is enabled to detect the largeness or smallness of the cleaning refrigerant amount by detecting the longness or shortness of the switching period of the four-way switching valve.
  • a piping cleaning system of one embodiment comprises the refrigerant resupply line connected to a refrigerant cylinder;
  • cleaning refrigerant can be resupplied from the refrigerant cylinder to the refrigerant resupply line.
  • the pressurizing valve is opened so that the refrigerant gas is introduced into the refrigerant cylinder from the transfer heat exchanger via the pressurizing line, by which the pressure of the refrigerant cylinder can be maintained at a specified level.
  • a piping cleaning system of another embodiment comprises the refrigerant bleed line connected to a refrigerant cylinder;
  • one aspect of the present invention provides a piping cleaning method for refrigeration units, in which refrigerant piping is cleaned by circulating a cleaning refrigerant through the refrigerant piping, the method comprising:
  • the amount of cleaning refrigerant circulated through the refrigerant piping is detected and, based on this detected amount of cleaning refrigerant, the amount of cleaning refrigerant is adjusted. Therefore, the amount of cleaning refrigerant in the cleaning circuit can be set to an appropriate level without any excess or shortage, so that the refrigerant piping can be cleaned efficiently.
  • a piping cleaning method for refrigeration units of one embodiment further comprises at least one of a step for resupplying a refrigerant to the cleaning circuit from a refrigerant resupply line which is connected to the heat exchangers and a step for bleeding the refrigerant of the cleaning circuit through a refrigerant bleed line which is connected to the transfer heat exchangers.
  • the refrigerant resupply line is connected to the transfer heat exchangers and refrigerant is resupplied to the cleaning circuit through this refrigerant resupply line, by which the shortage of cleaning refrigerant can be refilled.
  • the refrigerant bleed line is connected to the transfer exchangers, by which the refrigerant in the cleaning circuit is bled out through the refrigerant bleed line, the amount of cleaning refrigerant can be maintained at an appropriate level.
  • the heat pump use refrigerant circuit, which has a throttle mechanism connected between the two transfer heat exchangers, a compressor and a four-way switching valve, switches over a flowing direction of working refrigerant flowing through the two transfer heat exchangers by switching over the four-way switching valve, by which the sucking operation and the discharge operation of the two transfer heat exchangers are switched over,
  • a piping cleaning system of one embodiment comprises a cleaning circuit for cleaning refrigerant piping by circulating a cleaning medium therethrough;
  • the refrigerant piping is cleaned by circulating the cleaning medium through the refrigerant circuit.
  • the amount of cleaning medium with which the refrigerant piping is cleaned is detected by the cleaning medium detecting means and, based on this detected amount of cleaning medium, the amount of cleaning medium is adjusted by the adjusting means. Therefore, according to this piping cleaning system, any excess or shortage of the amount of cleaning medium with which the refrigerant piping is cleaned can be eliminated, and the refrigerant piping can be cleaned efficiently. An insufficient amount of cleaning medium would cause the cleaning performance to lower, and an excessive amount of cleaning medium would lead to less smooth circulation of the cleaning medium.
  • the cleaning medium is a mixed medium of detergent and refrigerant.
  • one aspect of the present invention provides a piping cleaning system in which a liquid refrigerant is circulated through refrigerant piping by two transfer heat exchangers provided on a heat pump use refrigerant circuit other than a cleaning circuit through which a cleaning refrigerant flows, the transfer heat exchangers alternately iterating a sucking operation by cooling a gas refrigerant within the transfer heat exchangers to effectuate depressurization thereof so that a refrigerant is sucked in from outside thereto, and a discharge operation for heating the refrigerant within the transfer heat exchangers to effectuate pressurization thereof so that a liquid refrigerant is discharged therefrom, wherein
  • the four-way switching valve switching means switches over the four-way switching valve in the heat pump use refrigerant circuit every specified time interval.
  • the specified time interval is set to a time duration elapsing while the refrigerant within the transfer heat exchangers is cooled from an entirely gas-refrigerant state into an entirely liquid-refrigerant state
  • the four-way switching valve is switched over in specified time interval, the need of sensors for detecting the refrigerant amount is eliminated.
  • one aspect of the present invention provides a piping cleaning method for refrigeration units, in which refrigerant piping is cleaned by circulating a cleaning medium through the refrigerant piping, the method comprising:
  • this piping cleaning method when the refrigerant piping is cleaned by circulating the cleaning medium through the cleaning circuit, the amount of cleaning medium with which the refrigerant piping is cleaned is detected and, based on this detected amount of cleaning medium, the amount of cleaning medium is adjusted. Therefore, any excess or shortage of the amount of cleaning medium with which the refrigerant piping is cleaned can be eliminated, so that the refrigerant piping can be cleaned efficiently.
  • the cleaning medium is a mixed medium of detergent and refrigerant.
  • one aspect of the present invention provides a piping cleaning method including: circulating liquid refrigerant through refrigerant piping by two transfer heat exchangers provided on a heat pump use refrigerant circuit other than a cleaning circuit through which cleaning refrigerant flows, the transfer heat exchangers alternately iterating a sucking operation by cooling a gas refrigerant within the transfer heat exchangers to effectuate depressurization thereof so that a refrigerant is sucked in from outside thereto, and a discharge operation by heating the refrigerant within the transfer heat exchangers to effectuate pressurization thereof so that the liquid refrigerant is discharged therefrom; and detecting an amount of cleaning refrigerant circulated through the refrigerant piping and, based on the detected amount of cleaning refrigerant, adjusting the amount of cleaning refrigerant, wherein
  • the four-way switching valve of the heat pump use refrigerant circuit is switched over every specified time interval.
  • the specified time interval is set to a time duration elapsing while the refrigerant within the transfer heat exchangers is cooled from an entirely gas-refrigerant state into an entirely liquid-refrigerant state
  • the necessary number of times of switching of the four-way switching valve can be reduced.
  • the four-way switching valve is switched over in specified time interval, the need of sensors for detecting the refrigerant amount is eliminated.
  • the specified time interval may also be set to a time duration elapsing while the refrigerant within the transfer heat exchangers is heated from an entirely liquid-refrigerant state into an entirely gas-refrigerant state.
  • Fig. 1 shows an embodiment of the piping cleaning system for refrigeration units according to the present invention.
  • the piping cleaning system 1 is equipped with a cleaning circuit 2.
  • a cleaning refrigerant which is given by R22, is circulated to clean existing connecting piping which comprises a gas line 3 and a liquid line 5.
  • This cleaning circuit 2 has a pipe 6 for directly connecting a valve 13 provided at an end of the gas line 3 and a valve 14 provided at an end of the liquid line 5 to each other, a pipe 10 connected between a valve 16 provided at the other end of the liquid line 5 and a valve V2 provided at an inflow port of a cleaning unit 7, and a pipe 12 connected between a valve 15 provided at the other end of the gas line 3 and a valve V6 provided at an outflow port of the cleaning unit 7.
  • the cleaning unit 7 is provided with an oil separator 17, and a liquid refrigerant is introduced into the oil separator 17 through an introductory pipe 18 connected between the oil separator 17 and the valve V2 placed at the inflow port. Also, the introductory pipe 18 is provided with a check valve 20 which permits a refrigerant flow from the valve V2 to the oil separator 17.
  • the introductory pipe 18 is connected at a point of a side wall of the oil separator 17 slightly upper than the vertical center of the side wall.
  • the oil separator 17 has, in lower part, a heat exchanging coil 21, and this heat exchanging coil 21 is connected to a later-described heat pump circuit. With this heat exchanging coil 21, the liquid refrigerant introduced from the introductory pipe 18 is evaporated. Also, an upper liquid level sensor 22 and a lower liquid level sensor 23 are attached on a side wall of the oil separator 17 at upper and lower positions of the coil 21. These upper liquid level sensor 22 and lower liquid level sensor 23 are implemented by float switches.
  • the oil separator 17 has a filter 24 fitted thereto at a position slightly below a top plate thereof and above the connecting point of the introductory pipe 18. Then the refrigerant evaporated by the coil 21 passes through the filter 24, foreign matters in the refrigerant are removed by the passage. Further, a discharge valve V7 is set at the bottom of the oil separator 17, so that oil accumulated at the bottom can be discharged through this discharge valve V7.
  • a pipe 29 is connected to the top plate of the oil separator 17, and this pipe 29 is branched into pipes 29A and 29B so as to be connected to the top plate of a first transfer heat exchanger 25 and the top plate of a second transfer heat exchanger 26, respectively.
  • the pipe 29 has a low pressure sensor 27 provided above the top plate of the oil separator 17.
  • the pipes 29A, 29B are equipped with check valves 30, 31, respectively. These check valves 30, 31 permit refrigerant flows from the oil separator 17 to the transfer heat exchangers 25, 26, respectively.
  • the transfer heat exchangers 25, 26 have heat exchanging coils 32, 33, and the heat exchanging coils 32, 33 are connected to a later-described heat pump circuit 200. Then, pipes 35, 36 are connected to bottoms of the transfer heat exchangers 25, 26, respectively, and these pipes 35, 36 are connected to a merged pipe 40 via check valves 37, 38 (forward directed toward the valve V6 placed at the outflow port), respectively. This merged pipe 40 is connected via a valve V1 to the valve V6 placed at the outflow port.
  • the heat pump circuit 200 has piping 46 for connecting a compressor 41, a heat exchanger 42, a four-way switching valve 43, the first transfer heat exchanger 25, the oil separator 17, the second transfer heat exchanger 26, the four-way switching valve 43, an accumulator 45 and the compressor 41 in this order.
  • a motor-operated expansion valve 48 is provided on a pipe 47 for connecting the first transfer heat exchanger 25 and the oil separator 17 to each other, and a check valve 51 (forward directed toward the oil separator 17) is provided on a pipe 50 which bypasses this motor-operated expansion valve 48.
  • the motor-operated expansion valve 48 is controlled in degree of openness with a signal derived from a heat sensing cylinder 54 attached to a pipe 53 placed on a side opposite to the motor-operated expansion valve 48 with respect to the first transfer heat exchanger 25. Also, a motor-operated expansion valve 56 is provided on a pipe 55 which connects the oil separator 17 and the second transfer heat exchanger 26 to each other, and a check valve 58 (forward directed toward the oil separator 17) is provided on a pipe 57 which bypasses this motor-operated expansion valve 56. The motor-operated expansion valve 56 is controlled in degree of openness with a signal derived from a heat sensing cylinder 61 attached to a pipe 60 placed on a side opposite to the motor expansion valve 58 with respect to the second transfer heat exchanger 26.
  • a pressure sensor P1 is attached on a suction-side pipe of the compressor 41, while a temperature sensor T2 and a pressure sensor P2 are attached on a discharge-side pipe of the compressor 41.
  • a refrigerant cylinder 71 is connected to the cleaning unit 7.
  • This refrigerant cylinder 71 is connected to the cleaning unit 7 by means of a refrigerant resupply line 72, a refrigerant bleed line 73 and a pressurizing line 74.
  • the refrigerant resupply line 72 is piping for resupplying the cleaning refrigerant to the first, second transfer heat exchangers 25, 26, and the refrigerant bleed line 73 is piping for returning the cleaning refrigerant from the first, second transfer heat exchangers 25, 26 to the refrigerant cylinder 71.
  • the pressurizing line 74 is piping for enhancing the internal pressure of the refrigerant cylinder 71 by introducing a gas refrigerant to the refrigerant cylinder 71 from the first, second transfer heat exchangers 25, 26.
  • the refrigerant resupply line 72 is connected to a solenoid valve SV3 via a valve 79 and a valve V4, and branched into two beyond the solenoid valve SV3 and further, via check valves 75, 76 (forward directed toward the transfer heat exchangers 25, 26), connected to the branch pipes 29A, 29B in the downstream of the check valves 30, 31.
  • the refrigerant bleed line 73 is connected to a solenoid valve SV4 via a valve 77 and a valve V3, and via this solenoid valve SV4 to a check valve 78 (forward directed toward the refrigerant cylinder 71), connected to a pipe 36 in the downstream of the check valve 38.
  • the pressurizing line 74 is connected to a solenoid valve SV5 via a valve 80 and a valve V5 , and branched into two beyond the solenoid valve SV5 and further, via check valves 81, 82 (forward directed toward the refrigerant cylinder 71), connected to the refrigerant resupply line 72 in the downstream of the check valves 75, 76.
  • the pressurizing line 74 between the valve V5 and the solenoid valve SV5 is connected to a branch point P1 of the refrigerant resupply line 72 via a solenoid valve SV2.
  • the solenoid valve SV2 When the solenoid valve SV2 is opened with the refrigerant cylinder 71 under a high pressure, the cylinder 71 can be degassed to the resupply line 72. In doing this, the pressurizing line 74 plays a role of depressurizing line.
  • the pressurizing line 74 is connected to the merged pipe 40 with a pipe 85 having the solenoid valve SV1 from between the solenoid valve SV5 and the check valves 81, 82 to between the valve V1 and the valve V6 provided at the outflow port.
  • the compressor 41 is operated, by which a liquid refrigerant is transferred from the heat exchanger 42 to the first transfer heat exchanger 25 by the compressor 41.
  • the first transfer heat exchanger 25 serves as a condenser.
  • the heat exchanger 42 plays a role of controlling the refrigerant temperature by making the heat of the refrigerant discharged out to a specified amount at a preceding stage of the first transfer heat exchanger 25. This heat exchange amount of the heat exchanger 42 can be controlled by turning on/off a fan 42a.
  • the degree of openness of the motor-operated expansion valve 48 is changed depending on the level of the temperature detected by the heat sensing cylinder 54 attached on the pipe 53, so that the temperature of the refrigerant that flows into the oil separator 17 is held within a specified temperature range. With a small degree of openness of the motor-operated expansion valve 48, the amount of refrigerant that flows from the bypass pipe 50 via the check valve 51 into the oil separator 17 increases.
  • the refrigerant that has lowered in temperature through the first transfer heat exchanger 25 flows into the heat exchanging coil 21 of the oil separator 17, where the refrigerant heats and evaporates the cleaning refrigerant that has flowed into the oil separator 17 by passing through the introductory pipe 18 via the valve V2.
  • the refrigerant that has been further cooled by having passed through the oil separator 17 subsequently passes through the motor-operated expansion valve 56 or the bypass pipe 57, flowing into the heat exchanging coil 33 of the second transfer heat exchanger 26. Then, this second transfer heat exchanger 26 serves as an evaporator.
  • the degree of openness of the motor-operated expansion valve 56 is changed, larger or smaller, depending on the level of the temperature detected by the heat sensing cylinder 61 attached on the pipe 60, so that the temperature of the refrigerant that flows into the second transfer heat exchanger 26 is held within a specified temperature range.
  • the refrigerant that has passed through the second transfer heat exchanger 26 enters the accumulator 45 via the four-way switching valve 43 and thereafter, in a gaseous state, returns to the compressor 41.
  • the cleaning refrigerant that has flowed in from the valve V2 placed at the inflow port of the cleaning unit 7 first flows into the oil separator 17, where the cleaning refrigerant is evaporated by the lower-part heat exchanging coil 21, thereby separated from oil, and foreign matters are removed by the upper-part filter 24. Then, the cleaning refrigerant, while transformed into a gaseous state, goes up through the pipe 29.
  • the second transfer heat exchanger 26 is in sucking operation, while the first transfer heat exchanger 25 is in discharging operation. Therefore, the cleaning refrigerant flows from the pipe 29 toward the pipe 29B, and cooled by the heat exchanging coil 33 of the second transfer heat exchanger 26, thereby being transformed from a gas refrigerant into a liquid refrigerant and accumulated within the second transfer heat exchanger 26. Then, when the second transfer heat exchanger 26 is filled with the liquid-phase cleaning refrigerant, the pump-side refrigerant, as it is cooled, is sucked into the compressor 41, causing the discharge temperature of the compressor 41 to lower, with the result that the detected temperature of the temperature sensor T2 lowers below a specified temperature. Then, a controller 100, receiving a signal from the temperature sensor T2, switches the four-way switching valve 43 to the broken-line position.
  • the refrigerant flowing direction of the heat pump circuit 200 is switched over, so that the first transfer heat exchanger 25 performs a cooling operation while the second transfer heat exchanger 26 performs a heating operation.
  • the cleaning refrigerant in the gaseous state derived from the oil separator 17 flows into the first transfer heat exchanger 25, and cooled so as to be transformed into a liquid refrigerant and accumulated within the first transfer heat exchanger 25.
  • the second transfer heat exchanger 26 the liquid refrigerant accumulated by the preceding cooling operation is heated and increased in pressure, and sent out to the pipe 36.
  • the cooled refrigerant flows from the pipe 53 into the compressor 41 so that the controller 100 switches over the four-way switching valve 43 to the solid-line position upon receiving a signal derived from the temperature sensor T2.
  • the four-way switching valve 43 is switched over when the discharge temperature of the compressor 41 has lowered by the refrigerant flowing from a transfer heat exchanger that performs the cooling operation into the compressor 41. Otherwise, the four-way switching valve 43 may also be switched over by detecting with the pressure sensor P2 that the discharge pressure of the compressor 41 has increased by the liquid-phase cleaning refrigerant having all flowed out from the transfer heat exchanger that performs the heating operation so that the heat exchange amount of the refrigerant on the pump circuit side has lowered.
  • the four-way switching valve 43 may be switched over when the internal pressure of the oil separator 17 detected by the low pressure sensor 27 has increased to the discharge temperature equivalent saturation pressure of the compressor 41 by the liquid-phase cleaning refrigerant being filled in the transfer heat exchanger that performs the cooling operation.
  • the gas line 3 and the liquid line 5 as existing connecting piping can be cleaned with the cleaning refrigerant forcedly circulated through the cleaning circuit 2. Accordingly, it becomes feasible to reuse the existing connecting piping, so that the laying work can be simplified to a great extent.
  • a lowered amount of cleaning refrigerant in the cleaning circuit 2 would lead to a lower heat exchange amount with working refrigerant in the heat pump circuit 200, and a faster increasing rate of discharge pressure as well as a faster decreasing rate of discharge temperature in the compressor, resulting in a shorter switching cycle period of the four-way switching valve 43.
  • the resultant shorter switching period (e.g. less than 2 min.) of the four-way switching valve 43 is detected by the controller 100, and the solenoid valve SV3 of the refrigerant resupply line 72 is kept opened for a specified time (e.g. 15 sec.).
  • the switching period of the four-way switching valve 43 is monitored for a monitoring period of about 10 minutes by the controller 100.
  • the switching period of the four-way switching valve 43 is not changed longer but kept short as it is, it is decided that the pressure of the refrigerant cylinder 71 is so low that the cleaning refrigerant cannot be resupplied to the transfer heat exchanger 25 or 26, where the pressurizing operation for the refrigerant cylinder 71 is executed.
  • the solenoid valve SV3 is opened again for a specified time.
  • the controller 100 decides that the cleaning refrigerant has been resupplied from the refrigerant cylinder 71 via the resupply line 72 to the refrigerant circuit 2, thus continuing the above-described basic operation. In this way, shortage of the cleaning refrigerant is refilled so that the piping (gas line 3, liquid line 5) can be cleaned efficiently without lowering the cleaning performance.
  • An excessive amount of cleaning refrigerant in the cleaning circuit 2 would lead to an increased amount of heat exchange with working refrigerant in the heat pump circuit 200, and a slower increasing rate of discharge pressure as well as a slower decreasing rate of discharge temperature in the compressor, resulting in a longer switching cycle period of the four-way switching valve 43.
  • the resultant longer switching period (e.g. more than 2 min.) of the four-way switching valve 43 is detected by the controller 100, and the solenoid valve SV4 of the refrigerant bleed line 73 is kept opened for a specified time (e.g. 15 sec.).
  • the switching period of the four-way switching valve 43 is monitored for a monitoring period of about 10 minutes by the controller 100.
  • the switching period of the four-way switching valve 43 is not changed shorter but kept long as it is, it is decided that the pressure of the refrigerant cylinder 71 is so high that the excess refrigerant cannot be returned from the transfer heat exchanger 25 or 26 to the refrigerant cylinder 71, where a degassing operation for the refrigerant cylinder 71 which will be described in the following paragraph is executed.
  • the switching period of the four-way switching valve 43 is changed shorter but still longer than a predetermined prescribed switching period, it is decided that the cleaning refrigerant is still excessive in the cleaning circuit 2, and so the solenoid valve SV4 is opened again for a specified time. Also, as a result of the monitoring, if the switching period returns to the prescribed switching period, the controller 100 decides that the excess refrigerant has been completely returned via the refrigerant bleed line 73 to the refrigerant cylinder 71, thus continuing the above-described basic operation.
  • the excess refrigerant is bled via the refrigerant bleed line 73 to the refrigerant cylinder 71, so that the amount of cleaning refrigerant in the cleaning circuit 2 can be maintained normally at an appropriate level and that the piping (gas line 3, liquid line 5) can be cleaned efficiently.
  • the refrigerant cylinder 71 With a high internal pressure of the refrigerant cylinder 71, or with the refrigerant cylinder 71 filled up, in an attempt to return excess refrigerant from the cleaning circuit 2 to the refrigerant cylinder 71 by the aforementioned cleaning bleeding operation, the refrigerant would not be returned from the refrigerant bleed line 73 to the refrigerant cylinder 71.
  • a float switch 91 attached to the refrigerant cylinder 71 indicates that the refrigerant cylinder 71 has been filled up, the refrigerant cylinder 71 should be replaced.
  • the controller 100 When the refrigerant bleeding operation is disabled with the float switch 91 not indicating a full, the controller 100, deciding that the internal pressure of the refrigerant cylinder 71 has been increased, performs the degassing operation of the refrigerant cylinder 71. In this case, it is also possible to directly measure the internal pressure of the refrigerant cylinder 71 to verify that the internal pressure has been increased. Further, with the provision of a pressure sensor for detecting the internal pressure of the refrigerant cylinder 71, the degassing operation for the refrigerant cylinder 71 may be automatically carried out by detecting by means of the controller 100 that the internal pressure of the refrigerant cylinder 71 has increased.
  • the solenoid valve SV2 is kept opened for a specified time period (e.g., 15 sec.), so that upper part of the refrigerant cylinder 71 is communicated with upper parts of the transfer heat exchangers 25, 26 via the valve V5, the solenoid valve SV2 and the check valves 75, 76.
  • the pressurizing line 74 serves as a depressurizing line so that the gas refrigerant within the refrigerant cylinder 71 can be bled via the solenoid valve SV2 serving as a pressure-reducing valve toward a cooling-side heat exchanger out of the transfer heat exchangers 25 and 26.
  • the cleaning refrigerant can be returned smoothly from the cleaning circuit 2 to the refrigerant cylinder 71.
  • the cleaning refrigerant could not be supplied from the refrigerant resupply line 72 to the cleaning circuit 2.
  • the float switch 91 of the refrigerant cylinder 71 indicates that the refrigerant cylinder 71 is empty, the refrigerant cylinder 71 should be replaced.
  • the pressurizing operation for the refrigerant cylinder 71 is carried out.
  • the pressurizing operation onto the refrigerant cylinder 71 may be automatically carried out by detecting by means of the controller 100 that the internal pressure of the refrigerant cylinder 71 has lowered.
  • the solenoid valve SV5 is kept opened for a specified time (e.g., 15 sec.) so that upper part of the refrigerant cylinder 71 is communicated with upper parts of the transfer heat exchangers 25, 26 via the valve V5, the solenoid valve SV5 and the check valves 81, 82.
  • a specified time e.g. 15 sec.
  • hot gas refrigerant can be introduced from the heating-side heat exchanger out of the transfer heat exchangers 25 and 26 toward the refrigerant cylinder 71.
  • the excess or shortage of the cleaning refrigerant is decided depending on the longness or shortness of the switching period of the four-way switching valve 43. Otherwise, it is also possible to decide the excess or shortage of the cleaning refrigerant by the liquid level sensors 22, 23 provided on the oil separator 17. That is, it may be arranged that if the liquid level in the oil separator 17 is over the upper liquid level sensor 22, the amount of cleaning refrigerant is decided to be excessive, and that if the liquid level is below the lower liquid level sensor 23, the amount of cleaning refrigerant is decided to be short.
  • the cleaning refrigerant of the cleaning circuit 2 is circulated by the heat pump circuit 200 in the above embodiment, the cleaning refrigerant may also be circulated by an ordinary transfer pump.
  • the refrigerant piping is cleaned with a refrigerant
  • a cleaning medium refers to, for example, a detergent only, or a mixed medium of detergent and refrigerant.
  • This mixed refrigerant of detergent and refrigerant is not only capable of enhancing the cleaning effect in cleaning the refrigerant piping but also easy to treat, hence particularly effective.
  • the controller 100 switches the four-way switching valve 43 every specified time interval, where this specified time interval may be set to a time duration elapsing while the refrigerant within the transfer heat exchangers 25, 26 is cooled from an entirely gas-refrigerant state into an entirely liquid-refrigerant state.
  • this specified time interval may be set to a time duration elapsing while the refrigerant within the transfer heat exchangers 25, 26 is cooled from an entirely gas-refrigerant state into an entirely liquid-refrigerant state.
  • the number of times of switching of the four-way switching valve 43 can be reduced.
  • the four-way switching valve 43 is switched according to the time setting, the need of a sensor for detecting the amount of cleaning refrigerant is eliminated.
  • the above-noted specified time may be set to a time duration elapsing while the refrigerant within the transfer heat exchangers 25, 26 is heated from an entirely liquid-refrigerant state into an entirely gas-refrigerant state.
  • the piping cleaning system and the piping cleaning method for refrigeration units according to the present invention are applicable for cleaning and reusing existing refrigerant piping, and in particular useful to cases where HCF refrigerants are used instead of CFC or HCFC refrigerants.
EP98941762A 1997-09-11 1998-09-08 Appareil et procede pour le nettoyage des tuyaux d'une unite de refrigeration Withdrawn EP1022524A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP24667297 1997-09-11
JP24667297 1997-09-11
PCT/JP1998/004020 WO1999013279A1 (fr) 1997-09-11 1998-09-08 Appareil et procede pour le nettoyage des tuyaux d'une unite de refrigeration

Publications (2)

Publication Number Publication Date
EP1022524A1 true EP1022524A1 (fr) 2000-07-26
EP1022524A4 EP1022524A4 (fr) 2001-03-21

Family

ID=17151906

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98941762A Withdrawn EP1022524A4 (fr) 1997-09-11 1998-09-08 Appareil et procede pour le nettoyage des tuyaux d'une unite de refrigeration

Country Status (6)

Country Link
US (1) US6279330B1 (fr)
EP (1) EP1022524A4 (fr)
JP (1) JP3840565B2 (fr)
CN (1) CN1161580C (fr)
AU (1) AU727631B2 (fr)
WO (1) WO1999013279A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2679931A1 (fr) * 2012-06-28 2014-01-01 Mitsubishi Heavy Industries, Ltd. Climatiseur
US20210063066A1 (en) * 2018-01-05 2021-03-04 Gree Electric Appliances, Inc. Of Zhuhai Circulation system of air conditioner, air conditioner, and air conditioner control method

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6871509B2 (en) * 2002-10-02 2005-03-29 Carrier Corporation Enhanced cooling system
KR100550566B1 (ko) * 2004-02-25 2006-02-10 엘지전자 주식회사 멀티형 히트 펌프의 제어 방법
JP3711999B2 (ja) * 2004-03-31 2005-11-02 ダイキン工業株式会社 調湿装置
US20050229856A1 (en) * 2004-04-20 2005-10-20 Malik Roger J Means and method for a liquid metal evaporation source with integral level sensor and external reservoir
US8418487B2 (en) * 2006-04-17 2013-04-16 Martin P. King Water chiller economizer system
CN101469962B (zh) * 2008-02-19 2010-12-01 孙成志 车载可卸式清洗装置及采暖系统准在线清洗方法
US8186175B2 (en) * 2009-08-11 2012-05-29 Te-Shou Lee Structural improvement for electric energy saving equipment
CN101738137B (zh) * 2009-11-26 2012-11-07 上海大学 换热器自动清洗和流向切换装置及工艺
US8980815B2 (en) * 2011-02-25 2015-03-17 Prestone Products Corporation Composition for cleaning a heat transfer system having an aluminum component
CN103143539B (zh) * 2013-02-08 2016-01-20 甘小琴 一种利用制冷剂进行汽车空调管路清洗的系统及方法
JP2015081695A (ja) * 2013-10-21 2015-04-27 三菱日立パワーシステムズ株式会社 炭素含有燃料熱交換器の監視・運転方法
CN105043161A (zh) * 2015-08-27 2015-11-11 成都科盛石油科技有限公司 石油宿舍中对地热管道内部清洗的装置
CN105066770A (zh) * 2015-08-27 2015-11-18 成都科盛石油科技有限公司 一种地暖管道内部清洗机构
CN105004216A (zh) * 2015-08-27 2015-10-28 成都科盛石油科技有限公司 石油宿舍中的管道内部清洗系统
FR3061034B1 (fr) * 2016-12-22 2019-05-31 IFP Energies Nouvelles Procede d'oligomerisation d'olefines mettant en œuvre un dispositif de nettoyage
CN112629316B (zh) * 2020-12-29 2022-03-29 湖北昂通水处理技术有限公司 全自动管刷在线清洗系统

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6029591A (ja) * 1983-07-28 1985-02-14 Mitsubishi Electric Corp 熱輸送装置
US4539817A (en) * 1983-12-23 1985-09-10 Staggs Michael J Refrigerant recovery and charging device
JPS6170388A (ja) * 1984-09-10 1986-04-11 Mitsubishi Electric Corp 熱伝達装置
JPS6170387A (ja) * 1984-09-10 1986-04-11 Mitsubishi Electric Corp 熱伝達装置
JPS6226491A (ja) * 1985-07-26 1987-02-04 Mitsubishi Electric Corp 熱伝達装置
US4982576A (en) * 1987-12-10 1991-01-08 Murray Corporation Air conditioner charging station with same refrigerant return and method
US5167126A (en) * 1990-12-12 1992-12-01 Cjs Enterprises, Inc. Refrigerant recovery and recycling assembly
US5363662A (en) * 1992-06-30 1994-11-15 Todack James J Refrigerant recovery and recycling method and apparatus
US5497625A (en) * 1994-11-03 1996-03-12 Spx Corporation Thermoelectric refrigerant handling system
US5533359A (en) * 1991-03-22 1996-07-09 Environmental Products Amalgamated Pty. Ltd. Apparatus for servicing refrigeration systems
WO1997015799A1 (fr) * 1995-10-24 1997-05-01 Daikin Industries, Ltd. Systeme de transport de chaleur
WO1997015789A1 (fr) * 1995-10-24 1997-05-01 Daikin Industries, Ltd. Appareil de conditionnement d'air
EP1016837A1 (fr) * 1997-04-02 2000-07-05 Daikin Industries, Ltd. Procede et appareil de lavage de conduits destines a des appareils refrigerants

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4982578A (en) * 1989-12-22 1991-01-08 Sporlan Valve Company Refrigerant purge valve
JPH04254173A (ja) 1990-12-27 1992-09-09 Nippondenso Co Ltd 冷媒回収装置
JPH05280839A (ja) 1992-03-31 1993-10-29 Suzuki Motor Corp カーエアコンの冷媒過充填防止装置
JPH06221727A (ja) 1993-01-27 1994-08-12 Mitsubishi Heavy Ind Ltd 冷媒システム洗浄装置
JP2593403B2 (ja) 1993-11-02 1997-03-26 ジャテック株式会社 冷凍または冷却サイクルの洗浄装置
US5379605A (en) * 1994-01-27 1995-01-10 Wynn's Climate Systems, Inc. Method for cleaning air conditioning system
JP3108270B2 (ja) 1994-02-28 2000-11-13 三洋電機株式会社 冷媒回収装置
US5415003A (en) * 1994-04-14 1995-05-16 Bertva; John T. Method for removing original type lubricant from air conditioning system and injecting replacement oil
US5582019A (en) 1995-05-08 1996-12-10 Emerson Electric Company Method and apparatus for recovering and purging refrigerant

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6029591A (ja) * 1983-07-28 1985-02-14 Mitsubishi Electric Corp 熱輸送装置
US4539817A (en) * 1983-12-23 1985-09-10 Staggs Michael J Refrigerant recovery and charging device
JPS6170388A (ja) * 1984-09-10 1986-04-11 Mitsubishi Electric Corp 熱伝達装置
JPS6170387A (ja) * 1984-09-10 1986-04-11 Mitsubishi Electric Corp 熱伝達装置
JPS6226491A (ja) * 1985-07-26 1987-02-04 Mitsubishi Electric Corp 熱伝達装置
US4982576A (en) * 1987-12-10 1991-01-08 Murray Corporation Air conditioner charging station with same refrigerant return and method
US5167126A (en) * 1990-12-12 1992-12-01 Cjs Enterprises, Inc. Refrigerant recovery and recycling assembly
US5533359A (en) * 1991-03-22 1996-07-09 Environmental Products Amalgamated Pty. Ltd. Apparatus for servicing refrigeration systems
US5363662A (en) * 1992-06-30 1994-11-15 Todack James J Refrigerant recovery and recycling method and apparatus
US5497625A (en) * 1994-11-03 1996-03-12 Spx Corporation Thermoelectric refrigerant handling system
WO1997015799A1 (fr) * 1995-10-24 1997-05-01 Daikin Industries, Ltd. Systeme de transport de chaleur
WO1997015789A1 (fr) * 1995-10-24 1997-05-01 Daikin Industries, Ltd. Appareil de conditionnement d'air
EP1016837A1 (fr) * 1997-04-02 2000-07-05 Daikin Industries, Ltd. Procede et appareil de lavage de conduits destines a des appareils refrigerants

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 152 (M-391), 27 June 1985 (1985-06-27) & JP 60 029591 A (MITSUBISHI DENKI KK), 14 February 1985 (1985-02-14) *
PATENT ABSTRACTS OF JAPAN vol. 010, no. 238 (M-508), 16 August 1986 (1986-08-16) & JP 61 070387 A (MITSUBISHI ELECTRIC CORP), 11 April 1986 (1986-04-11) *
PATENT ABSTRACTS OF JAPAN vol. 010, no. 238 (M-508), 16 August 1986 (1986-08-16) & JP 61 070388 A (MITSUBISHI ELECTRIC CORP), 11 April 1986 (1986-04-11) *
PATENT ABSTRACTS OF JAPAN vol. 011, no. 210 (M-604), 8 July 1987 (1987-07-08) & JP 62 026491 A (MITSUBISHI ELECTRIC CORP), 4 February 1987 (1987-02-04) *
See also references of WO9913279A1 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2679931A1 (fr) * 2012-06-28 2014-01-01 Mitsubishi Heavy Industries, Ltd. Climatiseur
US20210063066A1 (en) * 2018-01-05 2021-03-04 Gree Electric Appliances, Inc. Of Zhuhai Circulation system of air conditioner, air conditioner, and air conditioner control method
US11543162B2 (en) * 2018-01-05 2023-01-03 Gree Electric Appliances, Inc. Of Zhuhai Circulation system of air conditioner, air conditioner, and air conditioner control method

Also Published As

Publication number Publication date
CN1278906A (zh) 2001-01-03
AU8999698A (en) 1999-03-29
US6279330B1 (en) 2001-08-28
AU727631B2 (en) 2000-12-14
CN1161580C (zh) 2004-08-11
EP1022524A4 (fr) 2001-03-21
JP3840565B2 (ja) 2006-11-01
WO1999013279A1 (fr) 1999-03-18

Similar Documents

Publication Publication Date Title
US6279330B1 (en) Apparatus and method for cleaning pipes of refrigerating unit
EP1018628B1 (fr) Appareil de recuperation du frigorigene
CN100443833C (zh) 冷冻装置
US6321542B1 (en) Method for cleaning pipe and pipe cleaning apparatus for refrigerating apparatus
JP6207982B2 (ja) 冷暖フリーマルチ形空気調和機の冷媒配管洗浄方法
JP4289901B2 (ja) 空気調和装置の油回収方法及び空気調和装置
JPH03134451A (ja) 冷凍装置
WO1996012921A1 (fr) Appareil de conditionnement de l'air et procede pour controler l'operation de lavage de celui-ci
WO2021090806A1 (fr) Dispositif d'alimentation en eau chaude
JP3324460B2 (ja) 冷凍装置の配管洗浄装置および配管洗浄方法
JP2005315534A (ja) 空気調和システム、これに用いる分離回収ユニットおよび空気調和システムの洗浄方法
JP3255149B2 (ja) 冷媒流路洗浄装置及び冷媒流路洗浄方法
JP4141339B2 (ja) 空気調和装置及びその冷凍機油回収方法
JP3799906B2 (ja) 配管洗浄装置及び冷媒回収装置
JPH11182991A (ja) 配管洗浄装置
JP4295135B2 (ja) 配管洗浄装置および配管洗浄方法
JP2008309474A (ja) 配管洗浄装置
JP3564522B2 (ja) 配管洗浄装置、冷媒回収装置、及び冷媒再生装置
JP3494069B2 (ja) 冷媒回収装置及び冷媒回収方法
JP4295136B2 (ja) 配管洗浄装置および配管洗浄方法
JP2003343896A (ja) 空気調和機
JP2001255044A (ja) 配管洗浄装置及び冷媒再生装置
JP2000297973A (ja) 冷媒回収装置
JP2000304387A (ja) 冷媒循環装置
JPH09280613A (ja) 氷蓄熱装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20000405

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE ES FR GB IT

A4 Supplementary search report drawn up and despatched

Effective date: 20010206

AK Designated contracting states

Kind code of ref document: A4

Designated state(s): BE DE ES FR GB IT

RIC1 Information provided on ipc code assigned before grant

Free format text: 7F 25B 47/00 A, 7F 28G 9/00 B, 7F 25B 45/00 B, 7F 04F 1/04 B

17Q First examination report despatched

Effective date: 20030303

APBN Date of receipt of notice of appeal recorded

Free format text: ORIGINAL CODE: EPIDOSNNOA2E

APBR Date of receipt of statement of grounds of appeal recorded

Free format text: ORIGINAL CODE: EPIDOSNNOA3E

APAF Appeal reference modified

Free format text: ORIGINAL CODE: EPIDOSCREFNE

APBT Appeal procedure closed

Free format text: ORIGINAL CODE: EPIDOSNNOA9E

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

RIN1 Information on inventor provided before grant (corrected)

Inventor name: TAKEGAMI, MASAAKI

Inventor name: IIJIMA, TOSHIHIRO

Inventor name: UENO, TAKEO

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Effective date: 20090806